The researchers used information from Google Street View to determine what they call the "Green View Index," a rating that quantifies each city's percentage of canopy coverage based on aerial images. When the project launched in 2016, Treepedia featured 10 cities, but the team has since added 13 more to the list.

The goal of Treepedia is to make make urban planning more accessible to those outside the field, MIT's Carlo Ratti said in a press release.

Check out the top-ranking cities (and their percentages of tree coverage) below.